CN102051421A - Blast furnace burden and blast furnace iron-making method adopting same - Google Patents
Blast furnace burden and blast furnace iron-making method adopting same Download PDFInfo
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- CN102051421A CN102051421A CN2009102101345A CN200910210134A CN102051421A CN 102051421 A CN102051421 A CN 102051421A CN 2009102101345 A CN2009102101345 A CN 2009102101345A CN 200910210134 A CN200910210134 A CN 200910210134A CN 102051421 A CN102051421 A CN 102051421A
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Abstract
The invention relates to a blast furnace burden. The blast furnace burden contains sintered ore, lump ore and pellet ore, wherein the sintered ore is obtained by sintering a mixture composed of common iron ore concentrate and vanadium and titanium iron ore concentrate, the pellet ore is one made of vanadium and titanium iron ore concentrate or a mixture of pellet ore made of mixed iron ore concentrate composed of common iron ore concentrate and vanadium and titanium iron ore concentrate and pellet ore made of vanadium and titanium iron ore concentrate, the total amount of the vanadium and titanium iron ore concentrate for forming the sintered ore and the vanadium and titanium iron ore concentrate for forming the pellet ore ranges from 60 wt% to 75 wt% of the total amount of the blast furnace burden, and the common iron ore concentrate is free of vanadium and titanium. The invention also provides a blast furnace iron-making method adopting the blast furnace burden. The blast furnace burden provided in the invention can be used and has the advantages that the daily yield and the coal injection ratio of the blast furnace are increased, the comprehensive coke ratio of the blast furnace is reduced, and the consumption of the common iron ore concentrate is greatly reduced, so that the cost of smelting vanadium and titanium magnetite ore is greatly reduced.
Description
Technical field
The present invention relates to a kind of blast furnace burden and adopt the blast furnace iron-making method of this blast furnace burden.
Background technology
The Panzhihua Region v-ti magnetite ore resources that is richly stored with, these resources belong to high-titanium type vanadium-titanium magnetite, the mineral intergrowth that contains more than 30 kind of elements such as iron, titanium, vanadium, under existing technique of preparing condition, be difficult to realize that iron, titanium separate fully, the iron ore concentrate ferrous grade of selecting is lower and contain the TiO of 9-13 weight %
2, TiO when blast-furnace smelting
2Mainly enter slag, TiO in slag
2Content is up to 20-25 weight %.In ironmaking is produced, can the quality of blast furnace burden is directly connected to blast furnace steady running, if the sinter quality of blast furnace burden is poor, accident impact blast furnace ordinary production such as lubricating substance, hanging can often occur in blast furnace production, thereby influence pig iron output, influence the blast-furnace technique economic target.
For v-bearing titanomagnetite smelting, because vanadium titano-magnetite mainly enters blast furnace with the form of agglomerate usually, and vanadium titano-magnetite has low, the TiO of grade
2Content height, SiO
2The characteristics that content is low contain in the agglomerate of vanadium titano-magnetite and contain higher TiO
2, make sintering need very high-temperature, and in sintering process, generate uhligite (CaOTiO
2), the agglomerate fragility that obtains is big, intensity difference, rate of return mine height, thereby causes agglomerate output lower, second-rate.Now, blast furnace v-bearing titanomagnetite smelting furnace charge generally uses the burden structure of agglomerate, lump ore and mixing iron ore pellets, agglomerate wherein generally is equipped with a certain amount of common iron ore concentrate sintered obtaining by sefstromite concentrate, mixing the iron ore pellets ore deposit be to be cooperated by common iron ore concentrate and sefstromite concentrate, and allocate mixing behind a small amount of pellet binder into, through making the pellet that ball and roasting are made; Agglomerate is the agglomerate with common iron ore concentrate and sefstromite concentrate mix, sintering obtains.Because now domestic common iron ore concentrate is in short supply, and price also rising steadily, and the burden structure of this a large amount of use mixings iron ore concentrates makes the blast furnace ironmaking cost improve greatly, and therefore expectation is developed the blast furnace burden that makes new advances and reduced the blast furnace ironmaking cost.
Goal of the invention
The objective of the invention is to use the mixing iron ore pellets of high level for the blast furnace burden that solves prior art, thereby cause the ironmaking cost problem of higher, a kind of mixing iron ore pellets that can use lower aq is provided, reduce common iron ore concentrate consumption, thereby reduce ironmaking cost and higher blast furnace burden and the blast furnace iron-making method of gained iron quality.
The invention provides a kind of blast furnace burden, this blast furnace burden contains agglomerate, lump ore and pellet, the described agglomerate agglomerate that the mixture sintering that contains common iron ore concentrate and sefstromite concentrate obtains of serving as reasons, wherein, described pellet all is the mixture of the pellet that obtains of pellet that is obtained by sefstromite concentrate or the mixing iron ore concentrate that contains common iron ore concentrate and sefstromite concentrate of serving as reasons and the pellet that obtained by sefstromite concentrate; Total consumption of the sefstromite concentrate of the sefstromite concentrate of described formation agglomerate and formation pellet is the 60-75 weight % of blast furnace burden total amount; Described common iron ore concentrate is not for containing the iron ore concentrate of v element and titanium elements.
The present invention also provides a kind of blast furnace iron-making method, and this method comprises and place blast furnace to smelt blast furnace burden that wherein, described blast furnace burden is a blast furnace burden provided by the invention.
Blast furnace burden of the present invention by use agglomerate, lump ore, by the pellet that mixes pellet that iron ore concentrate obtains and obtain by sefstromite concentrate or use agglomerate, lump ore and the blast furnace burden of the pellet that obtains by sefstromite concentrate, use sefstromite concentrate pellet ore instead of part or whole by common iron ore concentrate and sefstromite concentrate mixes, pelletizing and calcination obtains ore deposit pelletizing; And improved the consumption of sefstromite concentrate in blast furnace burden, reduced the consumption of common iron ore concentrate in blast furnace burden, greatly reduce the blast furnace ironmaking cost, simultaneously, suitably be adjusted in the materials ratio of sefstromite concentrate in the preparation agglomerate process, and match with the optimization of pellet burden structure, can effectively improve vanadium titano-magnetite in the ratio of the raw material gross weight that is used for preparing blast furnace burden and improve quality of furnace charge, greatly reduce the cost of blast furnace ironmaking, and effectively improved blast furnace and produced iron amount and coal powder injection ratio, reduced comprehensive coke ratio.
Embodiment
Blast furnace burden provided by the invention contains agglomerate, lump ore and pellet, the described agglomerate agglomerate that the mixture sintering that contains common iron ore concentrate and sefstromite concentrate obtains of serving as reasons, wherein, described pellet all is the mixture of the pellet that obtains of pellet that is obtained by sefstromite concentrate or the mixing iron ore concentrate that contains common iron ore concentrate and sefstromite concentrate of serving as reasons and the pellet that obtained by sefstromite concentrate; Total consumption of the sefstromite concentrate of the sefstromite concentrate of described formation agglomerate and formation pellet is the 60-75 weight % of blast furnace burden total amount, is preferably 62-70 weight %; Described common iron ore concentrate is not for containing the iron ore concentrate of v element and titanium elements.
As long as although contain agglomerate, lump ore, the pellet that obtains by the mixing iron ore concentrate that contains common iron ore concentrate and sefstromite concentrate and the pellet that obtains by sefstromite concentrate or contain agglomerate, lump ore, the pellet that obtained by sefstromite concentrate can realize purpose of the present invention, but under the preferable case, total amount with described blast furnace burden is a benchmark, the content of described agglomerate can be 60-80 weight %, the content of described lump ore can be 3-12 weight %, and the content of described pellet can be 5-35 weight %.
According to blast furnace burden provided by the invention, the weight ratio of described pellet that is obtained by the mixing iron ore concentrate that contains common iron ore concentrate and sefstromite concentrate and the pellet that obtained by sefstromite concentrate can be 0-10: 1, be preferably 0.1-5: 1, more preferably all utilize the pellet that obtains by sefstromite concentrate.
The proportioning of the agglomerate in the blast furnace burden of the present invention, lump ore, the pellet that is obtained by the mixing iron ore concentrate that contains common iron ore concentrate and sefstromite concentrate and the pellet that obtained by sefstromite concentrate can reduce ironmaking cost in above-mentioned scope the time.
According to the present invention, on the one hand, in the usage ratio of suitably regulating the used sefstromite concentrate of preparation agglomerate, on the other hand, simultaneously, the mixture of pellet that the pellet that employing is obtained by vanadium titano-magnetite or adopt is obtained by the mixing iron ore concentrate that contains common iron ore concentrate and sefstromite concentrate and the pellet that obtains by sefstromite concentrate, the total consumption of sefstromite concentrate that makes the sefstromite concentrate of described formation agglomerate and form pellet is for forming the 60-75 weight % of the raw materials used gross weight of blast furnace burden, thereby improve the consumption of sefstromite concentrate, to reach the purpose of optimization.
(1) TiO in keeping blast-furnace slag
2Under the constant situation of content:
Reduce the vanadium titano-magnetite concentrate ratio in the agglomerate, and adopt the pellet that obtains by v-ti magnetite concentrate or adopt mixture by the pellet that mixes pellet that iron ore concentrate obtains and obtain by sefstromite concentrate, but (increasing amount that is sefstromite concentrate in the reduction of sefstromite concentrate in the agglomerate and the pellet reaches balance not improve a ton ferrovanadium concentrated ilmenite usage quantity, at this moment, ton ferrovanadium concentrated ilmenite usage ratio be increased to the raw material gross weight that is used to form blast furnace raw material about 60%), can reach and improve sinter quality and reduce the purpose that pig iron cost reduces simultaneously;
(2) TiO in blast-furnace slag
2Under the situation that content improves by a small margin:
Reduce the vanadium titano-magnetite concentrate ratio in the agglomerate, and adopt the pellet that obtains by v-ti magnetite concentrate or adopt mixture by the pellet that mixes pellet that iron ore concentrate obtains and obtain by sefstromite concentrate, reach the 60-67% that ton ferrovanadium titanium magnet ore concentrate usage ratio is increased to the raw material gross weight that is used to form blast furnace raw material, can reach and improve the purpose that sinter quality reduces the pig iron cost reduction simultaneously;
(3) TiO in blast-furnace slag
2Under the situation that content improves by a relatively large margin:
Can satisfy again under the situation of smelting demand that blast furnace obtains better index at relatively economical at sinter quality, suitably improve the vanadium titano-magnetite concentrate ratio in the agglomerate, and adopt the pellet that obtains by v-ti magnetite concentrate, reach ton iron and consume the 65-75% that the sefstromite concentrate ratio is increased to the raw material gross weight that is used to form blast furnace raw material, can reach the purpose that reduces pig iron cost.
According to the blast furnace burden of v-bearing titanomagnetite smelting of the present invention, wherein, in the described sefstromite concentrate, TiO
2Content be 9-13 weight %, V
2O
5Content be 0.5-0.7 weight %.
According to the present invention, the described method of making pellet by the sefstromite concentrate pelletizing can be carried out according to the method for this area routine, for example, can be by sefstromite concentrate and 1.5-2.5 parts by weight of adhesive with 100 weight parts, as wilkinite etc., mixing, the profit mill, dry, oxidizing roasting makes, the exsiccant method is preferably the exhausting drying, wind speed can be the 1-1.5 meter per second, the exsiccant initial temperature is to be 20-50 ℃, preheating temperature can be 400-1000 ℃, and the oxidizing roasting temperature of pelletizing can be 1200-1250 ℃ after the preheating, and the time of roasting can be 25-35 minute.
According to the present invention, the method for the described pellet that is obtained by the mixing iron ore concentrate that contains common iron ore concentrate and sefstromite concentrate can be for mixing common iron ore concentrate and sefstromite concentrate, and allocate a small amount of pellet binder into through making the pellet that ball and roasting are made.The preparation method who mixes the iron ore pellets ore deposit can be with reference to well known to a person skilled in the art that the method for preparing pellet prepares, and its preparation process does not repeat them here.According to the present invention, when being used to prepare the pellet that obtains by the mixing iron ore concentrate that contains common iron ore concentrate and sefstromite concentrate, wherein, the adjustable extent broad of the consumption weight ratio in sefstromite concentrate and common ore deposit, under the preferable case, the consumption weight ratio in described sefstromite concentrate and common ore deposit can be 1: 0.3-0.6.Described common iron ore concentrate is the known iron ore concentrate that does not contain v element and titanium elements of the technician of this area institute, and common iron ore concentrate used in the present invention can be the various iron ore concentrates of routine.
The ultimate compression strength of sefstromite concentrate pelletizing of the present invention can reach 3500-4800N/.The ultimate compression strength of blast furnace general requirement pellet is more than 2000N/, and the ultimate compression strength of all-sefstromite concentrate pelletizing used in the present invention can reach more than 3000N/, and maximum can reach 4800N/, can satisfy the requirement of blast furnace ironmaking to the ultimate compression strength of pellet fully.According to the present invention, described agglomerate is the agglomerate with common iron ore concentrate and sefstromite concentrate mix, sintering obtains.The preparation method of described agglomerate can carry out according to the preparation method of this area routine, for example, according to ratio of the present invention common iron ore concentrate and sefstromite concentrate is mixed sintering with fuel (charcoal, coke powder) and flux (magnesium powder and/or calcium oxide).Wherein, the consumption of sefstromite concentrate and common iron ore concentrate can prepare the consumption of sefstromite concentrate routine in the agglomerate for this area, under the preferable case, the consumption of sefstromite concentrate is for forming the 40-55% of the raw materials used gross weight of agglomerate, and the consumption of common iron ore concentrate is for forming the 30-40 weight % of the raw materials used gross weight of agglomerate.The sintering method that generally uses for example, will mix iron ore concentrate and flux and be added on the chassis through distributor for to carry out sintering on Dwight-Lloyd sintering machine now, carry out exhausting igniting sintering, advance with chassis, and sintering process is constantly carried out downwards by bed of material surface.The present invention preferably adopts magnetic roller distributor, and the rotation direction of magnetic roller is counterclockwise, and common ore deposit cloth magnetic roller is clockwise rotation direction, adopts this magnetic roller cloth can improve the reasonable distribution of compound granularity and fuel, makes the quality of the whole bed of material even.Described agglomerating temperature generally can be 1280-1380 ℃.
The content that improves MgO in the agglomerate is mobile favourable with desulfurization degree to improving its low-temperature reduction disintegration and blast-furnace slag, therefore, under the preferable case, can also add content of magnesia when the index agglomerate and can be the rhombspar of 20-30 weight %, the add-on of described rhombspar can be for forming the 2-4 weight % of the raw materials used gross weight of agglomerate.
Vanadium titanium agglomerate low-temperature reduction differentiation rate is than common ore deposit height, and DRI (3.15 millimeters) can reach more than 40%, therefore, under the preferable case, sprays mass concentration on the agglomerate before smelting and can be the CaCl of 1-3%
2Solution can cover one deck salt film at agglomerate surface, thereby slows down agglomerate 450-500 ℃ reduction, can stop in 500-600 ℃ of interval by Fe
2O
3Generate Fe
3O
4The reduction degradation that causes.
According to the blast furnace burden of v-bearing titanomagnetite smelting of the present invention, wherein, described agglomerate is preferably vanadium titanium agglomerate, and its basicity is 2.0-2.5.Use this preferred agglomerate, can effectively control blast-furnace slag basicity.
According to the present invention, described lump ore can be the various lump ores that do not contain v element and titanium elements known in those skilled in the art, and the granularity of preferred lump ore is the 5-80 millimeter, more preferably the 20-50 millimeter, the granularity of described lump ore can further be optimized the blast furnace burden structure in this scope the time.
Below in conjunction with embodiment the present invention is further specified, but the present invention is not limited in following embodiment.
In following examples and the Comparative Examples, the main component of sampling and measuring sefstromite concentrate is TFe:54.01 weight %, FeO:31.32 weight %, SiO
2Content is 3.3 weight %, V
2O
5: 0.56 weight %, TiO
2: 12.18 weight %; The main component of the common iron ore concentrate of sampling and measuring is TFe:58.01 weight %, FeO:15.6 weight %; The carbon content of coke powder is 84.56 weight %, and volatilization is divided into 1.45 weight %, ash content is 13.61 weight %, climbs steel metallurgic auxiliary materials company and produces; Calcium oxide content is 88 weight % in the Wingdale, climbs steel metallurgic auxiliary materials company and produces; The blue amount of bentonitic suction is 33.5g/100g; Colloid index is 99%; Expansion capacity is 12.5ml/g; TFe is 54 weight % in the lump ore, and granularity is the 20-50 millimeter.
Embodiment 1
This embodiment is used for explanation and adopts blast furnace burden of the present invention to carry out blast furnace iron-smelting method.
The preparation of vanadium titanium agglomerate: the Wingdale of the coke powder of the common iron ore concentrate of the sefstromite concentrate of 51.95 weight parts, 28.05 weight parts, 5.42 weight parts and 14.58 weight parts is carried out cloth and be added on the chassis on magnetic roller distributor, carry out sintering under 1350 ℃ then, obtain vanadium titanium agglomerate, the sintering machine speed of gained vanadium titanium agglomerate is that 1.71m/min, vertical sintering speed are 21.60mm/min, (the ISO barrate strength according to the GB13242 definition refers to get 7.5 kilograms of 40-10mm agglomerate in ISO drum unit (SQZG--4 type to barrate strength; Hebi City metallurgical machinery equipment company limited) after rotating 200 commentaries on classics in,＞6.3mm grade agglomerate accounts for the per-cent of whole agglomerate weight, is the important indicator of weighing sinter strength, and is high more, the intensity of expression agglomerate is good more) be 72.51%, mean particle size is 22.85mm.Obtain 80 weight part agglomerate.
Mix the preparation of iron ore pellets: with the sefstromite concentrate of 68 weight parts, the common iron ore concentrate of 32 weight parts and the wilkinite of 2.2 weight parts, the Large Electric of packing into mixer (HXDH-15L; Shangyu Hongxing Mechanical Instrumentation Produce Co., Ltd.) carries out mixing in, the large-size ball mill of packing into behind the mixing (ASM type horizontal ball mill; Wuxi City hypo drying machinery instrument factory) profit mill in, utilize balling disc (Tangshan Tang Ye step-down gear is made limited liability company) to make ball, go up the exhausting drying at chain grate machine (the positive source of Jiaozuo City machinofacture company limited), wind speed is 1.5m/s, dry initial temperature is 50 ℃, and preheating temperature is 400-1000 ℃, roasting in rotary kiln, maturing temperature is 1200 ℃, promptly gets and mixes iron ore pellets.Contain TiO in this pellet
27.5 weight %, V
2O
50.365 weight %, pelletizing ultimate compression strength is 2700N/.Obtain 100 weight part mixing iron ore pellets ore deposits.
The preparation of all-sefstromite concentrate pelletizing: with the wilkinite of the sefstromite concentrate of 100 weight parts and the 2.3 weight parts Large Electric mixer (HXDH-15L that packs into; Shangyu Hongxing Mechanical Instrumentation Produce Co., Ltd.) carries out mixing in, the large-size ball mill of packing into behind the mixing (ASM type horizontal ball mill; Wuxi City hypo drying machinery instrument factory) profit mill in, utilize balling disc (Tangshan Tang Ye step-down gear is made limited liability company) to make ball, go up the exhausting drying at chain grate machine (the positive source of Jiaozuo City machinofacture company limited), wind speed is 1.5m/s, dry initial temperature is 50 ℃, and preheating temperature is 400-1000 ℃, roasting in rotary kiln, maturing temperature is 1250 ℃, promptly gets the all-sefstromite concentrate pelletizing.Contain TiO in this all-sefstromite concentrate pelletizing
210.2 weight %, V
2O
50.53 weight %, pelletizing ultimate compression strength is 3350N/.Obtain 100 weight part all-sefstromite concentrate pelletizings.
Blast furnace ironmaking: the blast furnace burden of the above-mentioned all-sefstromite concentrate pelletizing of the above-mentioned mixing iron ore pellets of the lump ore of the above-mentioned vanadium titanium agglomerate of 65.3 weight parts, 8.2 weight parts, 21.5 weight parts and 5 weight parts sent into carry out blast furnace ironmaking (calculate as can be known, the total consumption that forms the sefstromite concentrate of agglomerate and form the sefstromite concentrate of pellet is 62 weight % of blast furnace burden total amount) in the blast furnace.Wherein, blast furnace daily output pig iron amount is 3130t, and the capacity factor of a blast furnace is 2.318t/m
3D, the blast furnace iron loss is 5.65%, and comprehensive coke ratio is 568.42kg/t.Fe, and coal is than being 118.94kg/t.Fe, and the pig iron is former, fuel cost is 1704.32 yuan.Pig iron composition is as shown in table 1 below.
Embodiment 2
This embodiment is used for explanation and adopts blast furnace burden of the present invention to carry out blast furnace iron-smelting method.
Method according to embodiment 1 prepares agglomerate, and different is that each material consumption is: sefstromite concentrate 49.8 weight parts, common iron ore concentrate 30.3 weight parts, coke powder 6.45 weight parts and Wingdale 13.45 weight parts.Obtain agglomerate 80.1 weight parts.
Blast furnace ironmaking: the blast furnace burden of the all-sefstromite concentrate pelletizing of lump ore, 15 weight part mixing iron ore pellets and 13.5 weight parts of the above-mentioned vanadium titanium agglomerate of 63.2 weight parts, 8.3 weight parts sent into carry out blast furnace ironmaking (calculate as can be known, the total consumption that forms the sefstromite concentrate of agglomerate and form the sefstromite concentrate of pellet is 63 weight % of blast furnace burden total amount) in the blast furnace.Wherein, blast furnace daily output pig iron amount is 3118t, and the capacity factor of a blast furnace is 2.310t/m
3D, the blast furnace iron loss is 6.31%, and comprehensive coke ratio is 562.99kg/t.Fe, and coal is than being 119.34kg/t.Fe, and the pig iron is former, fuel cost is 1673.86 yuan.Pig iron composition is as shown in table 1 below.
Embodiment 3
This embodiment is used for explanation and adopts blast furnace burden of the present invention to carry out blast furnace iron-smelting method.
Method according to embodiment 1 prepares agglomerate, and different is that each material consumption is: sefstromite concentrate 47.45 weight parts, common iron ore concentrate 32.55 weight parts, coke powder 6.7 weight parts and Wingdale 13.3 weight parts.Obtain agglomerate 80 weight parts.
Mix iron ore pellets according to the preparation of the method for embodiment 1, different is, the consumption of sefstromite concentrate is 74 weight parts, and the consumption of common iron ore concentrate is 26 weight parts.Contain TiO in this pellet
27.9 weight %, V
2O
50.4 weight %, pelletizing ultimate compression strength is 2750N/.Obtain 100 weight part mixing iron ore pellets ore deposits.
Blast furnace ironmaking: the blast furnace burden of the all-sefstromite concentrate pelletizing of the mixing iron ore pellets of the lump ore of the above-mentioned vanadium titanium agglomerate of 67.5 weight parts, 7.1 weight parts, 7.4 weight parts and 18 weight parts sent into carry out blast furnace ironmaking (calculate as can be known, the total consumption that forms the sefstromite concentrate of agglomerate and form the sefstromite concentrate of pellet is 63.5 weight % of blast furnace burden total amount) in the blast furnace.Wherein, blast furnace daily output pig iron amount is 3187.4t, and the capacity factor of a blast furnace is 2.361t/m
3D, the blast furnace iron loss is 5.4%, and comprehensive coke ratio is 560.97kg/t.Fe, and coal is than being 126.05kg/t.Fe, and the pig iron is former, fuel cost is 1666.01 yuan.Pig iron composition is as shown in table 1 below.
Embodiment 4
This embodiment is used for explanation and adopts blast furnace burden of the present invention to carry out blast furnace iron-smelting method.
Method according to embodiment 1 prepares agglomerate, and different is that each material consumption is: sefstromite concentrate 48.91 weight parts, common iron ore concentrate 31.09 weight parts, coke powder 5.86 weight parts and Wingdale 14.32 weight parts.Obtain agglomerate 80 weight parts.
Blast furnace ironmaking: the blast furnace burden of the all-sefstromite concentrate pelletizing of the lump ore of the above-mentioned vanadium titanium agglomerate of 72 weight parts, 5 weight parts and 23 weight parts sent into carry out blast furnace ironmaking (calculate as can be known, the total consumption that forms the sefstromite concentrate of agglomerate and form the sefstromite concentrate of pellet is 67 weight % of blast furnace burden total amount) in the blast furnace.Wherein, blast furnace daily output pig iron amount is 3152.3t, and the capacity factor of a blast furnace is 2.335t/m
3D, the blast furnace iron loss is 5.68%, and comprehensive coke ratio is 560.00kg/t.Fe, and coal is than being 127.11kg/t.Fe, and the pig iron is former, fuel cost is 1653.13 yuan.Pig iron composition is as shown in table 1 below.
Embodiment 5
This embodiment is used for explanation and adopts blast furnace burden of the present invention to carry out blast furnace iron-smelting method.
Method according to embodiment 1 prepares agglomerate, different is that each material consumption is: sefstromite concentrate 55 weight parts, common iron ore concentrate 25 weight parts, coke powder 5.45 weight parts, Wingdale 11.55 weight parts and content of magnesia are rhombspar 3 weight parts of 25 weight %.Obtain agglomerate 80 weight parts.
Blast furnace ironmaking: the blast furnace burden of the all-sefstromite concentrate pelletizing of the lump ore of the above-mentioned vanadium titanium agglomerate of 63 weight parts, 10 weight parts, 27 weight sent into carry out blast furnace ironmaking (calculate as can be known, the total consumption that forms the sefstromite concentrate of agglomerate and form the sefstromite concentrate of pellet is 70 weight % of blast furnace burden total amount) in the blast furnace.Wherein, blast furnace daily output pig iron amount is 3121t, and the capacity factor of a blast furnace is 2.313t/m
3D, the blast furnace iron loss is 6.50%, and comprehensive coke ratio is 570.99kg/t.Fe, and coal is than being 115.34kg/t.Fe, and the pig iron is former, fuel cost is 1703.32 yuan.Pig iron composition is as shown in table 1 below.
Comparative Examples 1
This Comparative Examples is used for explanation and adopts the reference blast furnace burden to carry out blast furnace iron-smelting method.
Method according to embodiment 1 prepares vanadium titanium agglomerate and mixes iron ore pellets, different is, blast furnace iron-smelting method is: the blast furnace burden of the mixing iron ore pellets of the lump ore of the above-mentioned vanadium titanium agglomerate of 65.3 weight parts, 8.8 weight parts, 25.9 weight parts is sent into carried out blast furnace ironmaking (calculate as can be known, the total consumption that forms the sefstromite concentrate of agglomerate and form the sefstromite concentrate of pellet is 60 weight % of blast furnace burden total amount) in the blast furnace.Blast furnace has a daily output of 3112t, and the capacity factor of a blast furnace is 2.305t/m
3D, the blast furnace iron loss is 7.48%, and comprehensive coke ratio is 575.00kg/t.Fe, and coal is than being 109.61kg/t.Fe, and the pig iron is former, fuel cost is 1800.32 yuan.Pig iron composition is as shown in table 1 below.
Comparative Examples 2
This Comparative Examples is used for explanation and adopts the reference blast furnace burden to carry out blast furnace iron-smelting method.
Method according to embodiment 1 prepares vanadium titanium agglomerate and mixes iron ore pellets, and different is:
The preparation of vanadium titanium agglomerate, proportion scheme is: sefstromite concentrate 50 weight parts, common iron ore concentrate 30 weight parts, coke powder 5 weight parts, Wingdale 15 weight parts, mean particle size is 22.85mm.Obtain agglomerate 80 weight parts.
Mix the preparation of iron ore pellets, proportion scheme is: sefstromite concentrate 65 weight parts, common iron ore concentrate 35 weight parts, wilkinite 2 weight parts.Contain TiO in this pellet
27.35 weight %, V
2O
50.36 weight %, pelletizing ultimate compression strength is 2590N/.Obtain mixing iron ore pellets ore deposit 100 weight parts.
The preparation of all-sefstromite concentrate pelletizing, proportion scheme is: sefstromite concentrate 100 weight parts, wilkinite 2 weight parts.Contain TiO in this all-sefstromite concentrate pelletizing
210.25 weight %, V
2O
50.54 weight %, pelletizing ultimate compression strength is 3120N/.Obtain all-sefstromite concentrate pellet ore 100 weight parts.
Blast furnace ironmaking: the blast furnace burden of the above-mentioned all-sefstromite concentrate pelletizing of the above-mentioned mixing iron ore pellets of the lump ore of the above-mentioned vanadium titanium agglomerate of 72 weight parts, 11 weight parts, 11 weight parts and 6 weight parts sent into carry out blast furnace ironmaking (calculate as can be known, the total consumption that forms the sefstromite concentrate of agglomerate and form the sefstromite concentrate of pellet is 58 weight % of blast furnace burden total amount) in the blast furnace.Wherein, blast furnace daily output pig iron amount is 3220.9t, and the capacity factor of a blast furnace is 2.385t/m
3D, the blast furnace iron loss is 6.30%, and comprehensive coke ratio is 550.6kg/t.Fe, and coal powder injection is than being 120.1kg/t.Fe, and the pig iron is former, fuel cost is 1840.46 yuan.Pig iron composition is as shown in table 1 below.
Each component content (weight %) in the table 1 vanadium titanium iron product
| Fe | C | Si | P | S | V | Ti | Other | |
| Embodiment 1 | 94.42 | 4.45 | 0.174 | 0.068 | 0.0590 | 0.296 | 0.228 | 0.305 |
| Embodiment 2 | 94.45 | 4.47 | 0.181 | 0.066 | 0.0645 | 0.298 | 0.221 | 0.249 |
| Embodiment 3 | 94.48 | 4.50 | 0.172 | 0.068 | 0.0675 | 0.302 | 0.201 | 0.210 |
| Embodiment 4 | 94.50 | 4.50 | 0.160 | 0.067 | 0.0660 | 0.296 | 0.195 | 0.216 |
| Embodiment 5 | 94.55 | 4.53 | 0.142 | 0.064 | 0.0720 | 0.303 | 0.160 | 0.179 |
| Comparative Examples 1 | 94.40 | 4.45 | 0.189 | 0.070 | 0.0600 | 0.287 | 0.232 | 0.305 |
| Comparative Examples 2 | 94.35 | 4.41 | 0.220 | 0.070 | 0.0550 | 0.280 | 0.280 | 0.335 |
By embodiment 1-5 and Comparative Examples 1 and Comparative Examples 2 are compared and can find, use blast furnace burden provided by the invention to compare with the blast furnace burden that uses prior art, blast furnace day output, coal powder injection ratio have obviously been improved on the one hand, reduced comprehensive coke ratio, also greatly reduce the consumption of common iron ore concentrate on the other hand, thereby greatly reduce the v-bearing titanomagnetite smelting cost.
Claims (10)
1. blast furnace burden, this blast furnace burden contains agglomerate, lump ore and pellet, the described agglomerate agglomerate that the mixture sintering that contains common iron ore concentrate and sefstromite concentrate obtains of serving as reasons, it is characterized in that described pellet all is the mixture of the pellet that obtains of pellet that is obtained by sefstromite concentrate or the mixing iron ore concentrate that contains common iron ore concentrate and sefstromite concentrate of serving as reasons and the pellet that obtained by sefstromite concentrate; Total consumption of the sefstromite concentrate of the sefstromite concentrate of described formation agglomerate and formation pellet is the 60-75 weight % of blast furnace burden total amount; Described common iron ore concentrate is not for containing the iron ore concentrate of v element and titanium elements.
2. blast furnace burden according to claim 1, wherein, total consumption of the sefstromite concentrate of the sefstromite concentrate of described formation agglomerate and formation pellet is the 62-70 weight % of blast furnace burden total amount.
3. blast furnace burden according to claim 1 wherein, is a benchmark with the total amount of described blast furnace burden, and the content of described agglomerate is 60-80 weight %, and the content of described lump ore is 3-12 weight %, and the content of described pellet is 5-35 weight %.
4. blast furnace burden according to claim 1, wherein, the weight ratio of described pellet that is obtained by the mixing iron ore concentrate that contains common iron ore concentrate and sefstromite concentrate and the pellet that obtained by sefstromite concentrate is 0-10: 1.
5. blast furnace burden according to claim 4, wherein, the weight ratio of described pellet that is obtained by the mixing iron ore concentrate that contains common iron ore concentrate and sefstromite concentrate and the pellet that obtained by sefstromite concentrate is 0.1-5: 1.
6. according to claim 1,2 or 3 described blast furnace burdens, wherein, in the described agglomerate that obtains by the mixture sintering that contains common iron ore concentrate and sefstromite concentrate, the consumption of sefstromite concentrate is for forming the 40-55% of the raw materials used gross weight of agglomerate, and the consumption of common iron ore concentrate is for forming the 30-40 weight % of the raw materials used gross weight of agglomerate; The basicity of described agglomerate is 2.0-2.5.
7. according to claim 1,4 or 5 described blast furnace burdens, wherein, the described pellet that obtains by the mixing iron ore concentrate that contains common iron ore concentrate and sefstromite concentrate be with common iron ore concentrate and sefstromite concentrate mix, through making the pellet that ball and roasting are made, described common iron ore concentrate is the iron ore concentrate that does not contain v element and titanium elements.
8. according to claim 1,4 or 5 described blast furnace burdens, wherein, the ultimate compression strength of the described pellet that is obtained by sefstromite concentrate is 3000-4800N/.
9. according to claim 1,2,4 or 5 described blast furnace burdens, wherein, in the described sefstromite concentrate, TiO
2Content be 9-13 weight %, V
2O
5Content be 0.5-0.7 weight %.
10. blast furnace iron-making method, this method comprise and place blast furnace to smelt blast furnace burden, it is characterized in that described blast furnace burden is any described blast furnace burden among the claim 1-9.
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Application publication date: 20110511 |